How to make four barrel in the shotgun? (Metro Exodus)

This detail you will find in the location Taiga, almost at the end of most locations.

Delqado
I found it in the Caspian sea

nibler99
Where the spiders were? If so, I area made a mistake, if not then I missed.

Delqado
And there are the spiders :) But Yes, when the cards were down, like somewhere out there found

nibler99
Just yesterday Taiga to beat and already I don't remember shit. It will be necessary to repeat, especially Damir I missed.

if shotgun the past, then the Caspian sea, on the ship, where slaves free is desirable (near the big water costs). In the top-most room.